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Update comments related to Swift and Substitute checks (#380)

Co-authored-by: Rangi <35663410+Rangi42@users.noreply.github.com>

--- a/engine/battle/core.asm

+++ b/engine/battle/core.asm

@@ -5368,10 +5368,10 @@

 .swiftCheck

 	ld a, [de]

 	cp SWIFT_EFFECT

-	ret z ; Swift never misses (interestingly, Azure Heights lists this is a myth, but it appears to be true)

+	ret z ; Swift never misses (this was fixed from the Japanese versions)

 	call CheckTargetSubstitute ; substitute check (note that this overwrites a)

 	jr z, .checkForDigOrFlyStatus

-; This code is buggy. It's supposed to prevent HP draining moves from working on substitutes.

+; The fix for Swift broke this code. It's supposed to prevent HP draining moves from working on Substitutes.

 ; Since CheckTargetSubstitute overwrites a with either $00 or $01, it never works.

 	cp DRAIN_HP_EFFECT

 	jp z, .moveMissed